Replacing Rocker Panels

[72longbed]

Hello,
this is my first communication with you fellow 67-72 Chevy truck owners and I'm glad that I found this site. From what I have read today, there are alot of very knowledgable members here and I have been looking for this type of forum for a long time. I have to replace the passenger side rocker panel on my 72 C-20. I picked up a 'GoodMark' outer and inner at the Carlisle show this past weekend. Although I have done all of the mechanical work on my truck, I am not a body man. Someone else did the paint and prep on the truck. My question is: can anyone refer me to a good step by step article or write up or whatever that explains in detail specific to the 67-72 how to remove and replace the entire front and back panel? Where to start, remove the door or not, etc,etc......

Thank you for whatever help you can offer!!
72longbed